[sdiy] Weird tubular, grey (sometimes blue) resistors

[Ian Fritz]

At 06:59 PM 11/13/2007, Eric Brombaugh wrote:

>On Nov 13, 2007, at 6:45 PM, Ian Fritz wrote:
>
>>At 05:34 PM 11/13/2007, Eric Brombaugh wrote:
>>
>>>Yeah - I got that too. My point was that nobody seems to have come
>>>up with an equivalent inverse inductance nomenclature. At least it
>>>doesn't pop up in the first few references on Google.
>>
>>In AC circuit theory -j/2*pi*L is the susceptance of an inductor.
>>(Susceptance = 1/Impedance).  Somewhat useful for parallel circuits.
>
>Well yeah - susceptance is the imaginary part of admittance and is
>measured in siemens. But it's not specific to an inductor the way
>henrys (henries?) are or the way farads/darafs are to a capacitor. So
>I guess the question is not "What is -j/2*pi*L called?" but rather
>"What's 1/L called?". And since Wikipedia (known font of wisdom and
>accuracy) mentions that darafs are not an approved SI unit, I guess
>this is all just for fun anyway. Are we still having fun? :)

Agreed, inductive susceptance is not exactly what you were asking 
about.  But it's the only place I know of where you would want to use 
1/L.  Maybe something with magnetic circuits, but those are usually 
discussed in terms of Reluctance.

Ian